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After you have stored an instance using Java's writeObject method, you can read that instance using readObject. Information about the stored instance flows serially through the FileInputStream instances as though it is flowing through conduits:

Instance 
  ^ 
  |     ObjectInputStream           FileInputStream 
  |   ----------------------      ---------------------- 
  *--------------------------------------------------------* 
      ----------------------      ----------------------   | 
                                                           | 
                                                         File